iEQ45 motors humming
Posted 22 April 2011 - 10:53 AM
I have not had a chance to really use it due to clouds, but I set it up in my house and have been learning how to use it. When I turn the mount on and set up the location and time, the motors are silent. If I use one of the arrow buttons, I can hear the appropriate motor run, then when I release it the motor seems to stop, but still hums. I'm not sure if the hum means it is still running very slowly or if it is just humming but not moving. If I hit the same button again and release, the motor stops and is silent. It generally repeats this pattern of hum/silent after each time I use the button, but it is not always consistent. For example, some times it might hum two times in a row. This effect occurs with either motor. Note that it appears that the mount is stopped because the RA indication on the handset changes slowly.
After setting up the mount indoors, I told it to goto the location of the sun, which it did. I could hear the RA motor running in its tracking mode. The RA indication on the handset was not changing so it appears to be tracking correctly. I then told it to go back to the zero position. It did so, and afterwards, both motors were humming. I've left it there for about 10 minutes now and they are still humming. Again, the mount appears to not be moving because the RA display is slowly changing.
Other than this hum, the mount seems to be working fine ... at least as much as I can determine indoors. I have reported this to iOptron and they have not heard of the issue and will look into it. But I was wondering if other owners could try this on your mount and let me know if you are experiencing this or not.
Posted 22 April 2011 - 11:24 AM
Posted 22 April 2011 - 01:15 PM
Posted 22 April 2011 - 01:46 PM
The sound reminds me of an electric train set I had as a kid. There was a lever on a power supply that increased the voltage to adjust the train speed. As you increased the voltage from zero, the train would start to make a humming sound before it got to the point where there was actually enough voltage to get things moving. That's what this sounds like. I know these motors are nothing like what you'd find on an electric train set, but nonetheless, that's the sound.
Posted 22 April 2011 - 02:01 PM
Posted 22 April 2011 - 03:32 PM
Posted 22 April 2011 - 03:45 PM
Posted 22 April 2011 - 09:17 PM
Posted 22 April 2011 - 10:09 PM
Even though they say it's "normal", still doesn't seem right to me. I'm guessing there's some little glitch in the GoTo Nova firmware. Like SweenyTodd, I can tap a slew button and get it to stop. I guess I won't lose any sleep over it, but I'm hoping the next firmware update takes care of it.
Posted 23 April 2011 - 09:13 AM
1. Turned the mount on and it was immediately in tracking mode (CEL) with the pulse sound coming from the motors. The R.A. display static. The previous night I had imaged and had parked the mount prior to powering off. Pressing Stop on the hand controller stopped tracking. No motor hum.
2. Turned the mount off and then back on and the mount motors were silent and not tracking. Pressing stop enabled tracking and the "oscillation" sound from the motors is heard.
3. Power cycled the mount again and tracking was off. Started and then stopped the mount tracking with the stop button but this time when the mount was stopped the motor humming is heard. Cycled the stop button a few times and the motor sound changed a bit until after a fourth stop the motor was silent. Seems random.
Posted 23 April 2011 - 09:53 AM
Seems to me the motors are getting fed some small amount of power, but are not moving. While I don't see that as any kind of immediate problem, I can't imagine that it's particularly good for the motors long term.
Posted 23 April 2011 - 03:27 PM
Posted 23 April 2011 - 03:34 PM
Posted 24 April 2011 - 01:03 AM
Posted 24 April 2011 - 04:31 AM
This is not a problem, its just a servo loop continuing to hunt for its correct position. I heard the same noises when working on Aircraft instrument servo systems.
Posted 24 April 2011 - 04:49 PM
Posted 25 April 2011 - 07:47 AM